test: add Playwright coverage and test ids for CpsTreeAutocompleteComponent

[fateeand]

Summary

• Added 23 tests: keyboard arrow navigation, Escape close, directory expand/collapse via click, Enter/Space selecting a leaf (+closing), Enter expanding a directory, virtual-scroll rendering, chip removal (click + double-Backspace), prefix icon rendering, required-field validation, two-way binding readout, accessible-name computation, hideDetails, openOnClear=false, real typing filters the tree, Enter confirms typed text (exact match / no-match revert), custom emptyMessage rendering, clicking the box moves real focus to the input and visually hides the selected-label span (real computed-opacity assertion), expandAll()/collapseAll().
• Added test ids to the component's template.
• Added 5 demo examples to cover hideDetails, openOnClear=false, ariaLabel-only, expandAll/collapseAll and custom emptyMessage.
• Fixed a Prettier reformat on CpsTreeAutocompleteAppearanceType.
• Fixed the clear icon's (mousedown) handler only called preventDefault(), not stopPropagation(). Since the box wrapper listens on (mousedown)="onBoxClick()", the mousedown still bubbled up and unconditionally reopened the dropdown completely bypassing openOnClear=false.
• Fixed a bug in case when there is no selected value, where expandAll()/collapseAll() mutated TreeNode.expanded in place but never told PrimeNG's p-tree (which is OnPush) to re-render, so the DOM silently never reflected the call.

TODO: Merge with feat: add test ids to tree autocomplete component and fix openOnClear behavior

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Release notes:

• added Playwright E2E coverage for cps-tree-autocomplete
• added test ids to cps-tree-autocomplete
• fixed cps-tree-autocomplete openOnClear behavior

[github-actions]

Coverage report for library

St.❔	Category	Percentage	Covered / Total
🟡	Statements	77.88%	6273/8055
🟡	Branches	66.94%	2891/4319
🟡	Functions	79.45%	1183/1489
🟡	Lines	78.85%	5865/7438

Test suite run success

2474 tests passing in 76 suites.

Report generated by 🧪jest coverage report action from 26fe9fe

[github-actions]

Playwright test results

 804 passed

Details

 804 tests across 33 suites
 24 minutes, 16 seconds
 26fe9fe
 For details, download the Playwright report

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Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.